12 results about "Lead carbonate" patented technology

The present invention belongs to the technical field of lead-acid batteries, and specifically relates to a method for determining the content of basic lead carbonate, tribasic lead sulfate, and tetrabasic lead sulfate in lead paste for positive electrodes of lead-acid batteries. The present invention solves the problem in the prior art that conventional heating methods cannot accurately determine whether moisture has been completely removed, resulting in incomplete moisture removal during heating or the weighed object reabsorbing some moisture from the air during the weighing process, leading to distorted measurement results. The present invention effectively differentiates and measures the contents of 3PbO·PbSO4·H2O and 2PbCO3·Pb(OH)2 by changing the weight of the lead paste at corresponding temperatures. The method can further determine the content of 4PbO·PbSO4 in combination with the test method for "GB T 23636-2017 Lead-acid Battery Plates," thereby obtaining the accurate contents of 3PbO·PbSO4·H2O, 4PbO·PbSO4, and 2PbCO3·Pb(OH)2.

The present invention belongs to the field of metallurgy and relates to a method for removing impurities from copper electrolysis lean liquid. The method comprises the following steps: S1: adding an oxidant and bismuth trioxide to the copper electrolysis lean liquid. After the reaction, solid-liquid separation is performed to obtain an oxidation slag and a primary impurity-removing liquid; S2: adding lead carbonate and lead oxide to the primary impurity-removing liquid obtained in step S1. After the reaction, a precipitated slag and a secondary impurity-removing liquid are obtained. The secondary impurity-removing liquid has an As concentration of ≤0.1 g / L, a Bi concentration of ≤0.05 g / L, and a Sb concentration of ≤0.05 g / L. This method can meet the requirement for returning the copper electrolysis lean liquid to electrolysis after impurity removal, while avoiding environmental pollution caused by direct discharge, resulting in significant economic and environmental benefits.

The invention provides a method for recovering high-purity lead carbonate from lead sulfate slag, which comprises the following steps: (1) mixing and slurrying lead sulfate slag, calcium salt, an activating agent and water, then adding the slurried material into a closed reaction kettle, introducing carbon dioxide gas, heating, stirring, and filtering after the reaction is finished to obtain filtrate and transformation slag; (2) mixing and slurrying the transformation slag and water, and adding the mixture into a centrifugal separator for beneficiation to obtain gravity concentrate and gravity tailings; (3) the gravity concentrate and an acetic acid solution are mixed and pulpified, then the pulpified material is added into a reaction kettle, heating and stirring are conducted, filtering is conducted after the reaction is finished, and lead acetate leaching liquid is obtained; and (4) adding the lead acetate leachate into a closed reaction kettle, introducing carbon dioxide gas, heating, stirring, and filtering after the reaction is finished to obtain high-purity lead carbonate and a regenerated acetic acid solution. Compared with the prior art, the method is low in cost, free of wastewater and good in environmental benefit.

The invention discloses a monocrystal lead strontium titanate thin film and preparation and application thereof. According to the preparation method, lead carbonate, strontium carbonate and tetra-n-butyl titanate are taken as main raw materials, the high-quality large-area lead strontium titanate single crystal film with the micron-level thickness can be prepared in the environment with the temperature lower than the Curie temperature through a hydrothermal method, and the lead strontium titanate single crystal film has self-driven pyroelectric response under irradiation of infrared light with the wavelength of 1064 nm; the system has wide potential application prospects in the fields of security monitoring, human body detection, infrared imaging, intelligent temperature control, night vision equipment, medical diagnosis and the like. The preparation method is a low-temperature hydrothermal method, the process is simple and easy to operate, raw materials are simple and easy to obtain, and the problem that a high-quality lead strontium titanate single crystal film cannot grow at low temperature for a long time is solved.

The present invention discloses a pearlescent iridescent glazed tile, comprising, from bottom to top, a body layer, a base glaze layer, an inkjet printing layer, a dry particle positioning layer, and a pearlescent iridescent glaze layer. The dry particle positioning frit glaze comprises the following raw materials, calculated by weight: 8-15 parts quartz, 5-12 parts alumina, 10-15 parts zircon powder, 5-10 parts lead carbonate, and 49-87 parts flux I. The pearlescent iridescent glaze comprises the following raw materials, calculated by weight: 4-8 parts kaolin, 92-96 parts pearlescent iridescent frit, 0.2-0.5 parts sodium carboxymethyl cellulose, 0.2-0.4 parts sodium tripolyphosphate, and 35-45 parts water. The pearlescent iridescent glazed tile proposed by the present invention is advantageous for presenting a strong and uniform pearlescent iridescent effect on the surface of the glazed tile while ensuring the decorative effect of the inkjet printing layer.

This invention belongs to the field of wet electrolytic refining technology for recycled lead, and provides a method for electrolytically preparing ultra-high purity lead. It involves constructing a 1-hydroxyethylidene-1,1-diphosphonic acid-modified lead carbonate seed layer on the cathode plate surface, combined with a bypass impurity removal unit to continuously remove impurity ions from the electrolyte, and then using staged current density electrolysis to ensure uniform nucleation and stable deposition of lead on the cathode surface. The resulting cathode lead has a purity of not less than 99.996 wt%, and the deposited layer is dense, flat, and has a low risk of inclusions. This method solves the problems of difficulty in balancing high-throughput deposition and ultra-high purity, as well as the difficulty in synchronizing seed layer adhesion stability and pollution control in existing processes. It is suitable for the high-value preparation of recycled lead from waste lead-acid batteries.

The invention belongs to the technical field of metallurgy, and relates to a copper electrolysis barren solution impurity removal method which comprises the following steps: S1, adding an oxidizing agent and bismuth trioxide into a copper electrolysis barren solution, and after reaction, carrying out solid-liquid separation to obtain oxidizing slag and a primary impurity removal solution; and S2, adding lead carbonate and lead oxide into the primary impurity removal liquid obtained in the step S1, and reacting to obtain precipitation slag and secondary impurity removal liquid. And in the secondary impurity removal liquid, the As concentration is less than or equal to 0.1 g / L, the Bi concentration is less than or equal to 0.05 g / L, and the Sb concentration is less than or equal to 0.05 g / L, so that the requirement that the copper electrolysis barren solution is returned for electrolysis after impurity removal can be met, meanwhile, the environmental pollution caused by direct discharge is avoided, and the economic benefit and the environmental benefit are remarkable.

The present invention provides a method for recovering lead from lead sulfate waste, comprising: (1) mixing the lead sulfate waste, magnesium salt and water to form a slurry, then adding the slurry to a closed reactor, introducing carbon dioxide gas, heating, stirring, and filtering after the reaction to obtain a magnesium sulfate filtrate and a lead carbonate residue; the magnesium salt is one or more of magnesium oxide, magnesium hydroxide, magnesium carbonate, basic magnesium carbonate, and magnesium bicarbonate solution; (2) adding a fluorosilicic acid solution to the lead carbonate residue to obtain a lead fluorosilicate solution, electrolyzing the lead fluorosilicate solution to obtain electrolytic lead and electrolytic waste liquid; (3) adding calcium hydroxide to the magnesium sulfate filtrate, heating, stirring, and filtering after the reaction, and performing beneficiation and classification of the mixed residue through a hydrocyclone to obtain a light material mainly composed of magnesium hydroxide and a heavy material mainly composed of calcium sulfate. Compared with the prior art, the present invention has low cost, no wastewater generation, and good environmental benefits.

This invention relates to the field of chemical production, and particularly to a method for hydrometallurgical refining of lead from lead sulfide concentrate, comprising the following steps: Step S1: Catalytically oxidizing lead sulfide concentrate to obtain a first filtrate and a first filter residue; Step S2: Using an alkaline magnesium-based conversion agent to convert lead sulfate in the first filter residue into lead carbonate, obtaining a second filtrate and a second filter residue containing lead carbonate; Step S3: Leaching the lead carbonate in the second filter residue using an acetic acid solution and precipitating it with carbon dioxide to obtain high-purity lead carbonate; Step S4: Leaching the high-purity lead carbonate using a fluorosilicic acid solution and electrolyzing it to obtain metallic lead product. Compared with the prior art, the reagents used in this invention are low-cost and renewable, the reaction conditions are mild, no wastewater is generated, and the obtained metallic lead product has high purity.

The present invention discloses a pearlescent frit with a layered carrier structure and a ceramic tile using the same. The pearlescent frit comprises the following raw materials, calculated by weight: 30-40 parts perlite, 10-15 parts calcined alumina, 8-15 parts potassium hexafluoroaluminate, 2-8 parts zinc oxide, 5-15 parts calcite, 5-15 parts potassium feldspar, 3-8 parts calcium fluoride, 1-5 parts zirconium oxide, 5-12 parts cerium oxide, and 5-10 parts lead carbonate. The pearlescent frit with a layered carrier structure and the ceramic tile using the same, proposed in this proposal, can effectively enhance the pearlescent effect of the frit, thereby overcoming the shortcomings of the prior art.

The invention belongs to the technical field of comprehensive utilization of waste lead storage batteries, and particularly relates to a method for preparing battery-grade lead oxide from lead plaster in the waste lead storage batteries. The method comprises the following steps: pretreating the waste lead storage battery to obtain lead paste; the method comprises the following steps: performing green leaching on the lead plaster by using a deep-eutectic solvent solution formed by an amide compound / lactic acid, so that lead in the lead plaster of the waste lead storage battery is converted into a soluble complex of lead, and other impurities are retained in leaching residues and are not leached; adding a saturated carbonate solution into the lead-containing leachate obtained by solid-liquid separation to obtain high-purity lead carbonate precipitate; and roasting and grinding to obtain a battery-grade lead oxide product. The method has the advantages of being environmentally friendly in process and easy and convenient to operate, leaching of impurities except lead can be effectively inhibited, the purity and stability of the product can be improved, cyclic utilization of the leaching agent can be achieved, the production cost is reduced, an innovative solution is provided for high-valued and sustainable recovery of the lead plaster in the waste lead storage battery, and the method is suitable for industrial production. And the method has remarkable social, economic and environmental benefits.

The invention provides electronic ceramic powder as well as a preparation method and application thereof, and belongs to the technical field of electronic ceramics. The preparation method comprises the following steps: adding tetrabutyl titanate into aluminum sol, adding aluminum powder, uniformly mixing, drying, mixing with barium carbonate, strontium carbonate and lead carbonate, calcining, adding into rare earth doped titanium sol, calcining, and carrying out wet ball milling and freeze drying to obtain the electronic ceramic powder. The prepared electronic ceramic powder effectively overcomes the problems that traditional high-purity aluminum oxide powder is prone to agglomeration, high-temperature shrinkage, high in sintering energy consumption and the like, a product prepared from the prepared electronic ceramic powder is excellent in comprehensive performance, cost is reduced, operation is easy, and wide application prospects are achieved.